Question

it is the true intent and meaning of this act not to legislate slavery into any state or territory or to exclude it there from, but to leave the people thereof perfectly free to form and regulate their domestic institutions in their own way, subject only to the federal constitution. who said this and what idea does it express? henry clay on the need for compromise abraham lincoln on forming a more perfect union stephen douglas on popular sovereignty john c. calhoun on states’ rights

Explanation:

The statement reflects the idea of popular sovereignty, where people in a state or territory are free to decide on domestic - like slavery - based on their will within the bounds of the Federal Constitution. Stephen Douglas was a proponent of popular sovereignty.

Answer:

C. Stephen Douglas on popular sovereignty